Writing-desk



N.PETERS. PHOTQ-UTHOGRAPMER. WASHINGTON, D C.

UNITED STATES PATENT OFFICE,

WILLIAM G. WOLF, OF PHILADELPHIA, PENNSYLVANIA.

WRITING-DESK.

Specification of Letters Patent No. 13,371, dated July 31, 1 855.

To all w/zom it may concern:

Be it known that I, IVM. G. YWOLF, Philadelphia, in the county of Philadelphia, in the State of Pennsylvania, have invented a new and Improved Desk styled Self-adjusting; and I do hereby declare that the following is a full and eXact description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereon.

The nature of my invention consists of a double fall A and G hinged on a grooved frame B, supported by a tongue C with a partitioned tray D riding thereon, with horizontal inclined levers E attached to fall A working over any given center F also an attached fall G hinged to fall A with an upright traveler H working through an upright mortise I on an inclined and declined plane J underneath attached fall G.

By drawing forward the attached fall G dropping on the upright traveler H, then on the declined portion of the plane J, which keeps it from a collision with the integral portions D-viz., tray*and by a back motion the traveler H, then on the inclined ofl portion of the planes, pushes up the attached fall G clear of the tray, as -in Figure 4. Again by a forward motion the inclined levers E underneath fall A and G smaller and greater causes a graduation to the desk. Again by a back motion then the inclined levers underneath falls A and G the greatest working in concert with traveler H on inclined and declined planes J causes the desk to be entirely concealed.

`What I claim as my invention and desire to secure by Letters Patent is- The horizontal inclined levers E and inclined and declined planes J with the upright traveler H working thereon which causes a graduation that of a desk to be formed or else entirely concealed at pleasure as herein described, using for that purpose the aforesaid horizontal inclined levers, inclined planes, and upright traveler.

WILLIAM G. WOLF.

J oHN McCoY. A 

